John o



I. G. CAPSTAFF.

METHOD OF AND ARTICLE FOR MAKINGv PHOTOGRAPHIG POSITIVE PRINTS.

APFLICATION FILED mm 14. m4.

1,303,635. I Patented May13, 1919.

A B V A Sivan/M04: J hn 61 Capsiaff' his Meme/ Bill H ED srnrns PATENT oriuoa JOHN G. OAPSTAFF, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK COMP, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

iaoaeaa.

Specification of Letters Patent.

Patented May13, 1919.;

Application filed ll'uly it, 19M. Serial lilo. $51,009.

To all whom it may concern:

Be it known that T, J OHN G. CArs'rArr, a subject of the King of Great Britain, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Methods of and Articles for Making Photographic Positive-Prints; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and'to the reference-letters marked thereon.

My present invention has for its object to provide an article for and a method of taking and developing photographic positives on a single support, whereby the usual operations of making a negative" and separately applying the same to a sensitized surface, which subsequently becomes the positive print, is obviated. By the use of this article and the method, positive prints may be made in a single apparatus, such for in-.

stance as an automatic coin controlled machine, without the necessity of hand manipulation, the ultimate support of the positive print serving also as a support for the temporary negative. i

The article by means of which the method is carried out consists generally oil a film embodying a support, an insoluble sensitive layer or coating anda superposed remov able sensitized layer or coating of greater sensitiveness than the former, and the method consists generally in exposing such an article in a camera to the action of light passing through the lens, then developing the image formed in the outer, more sensitive coating only, preferably washing the developer from the print thusformed, then exposing the lower and less sensitive coating to I the action or actinic light through the developed negative, and outer coating, carrying with it the negative image and subsequently developing, fixing. and washing the final print.

In the accompanying drawing, is shown a greatly enlarged sectional view of a film on sensitized element embodying my invention, and used in carrying out the method.

The sensitized element is formed of a support, indicated by A in the drawing, and

preferably of white or light colored paper ally removing the Y upon which is coated or deposited, in the usual manner, a coating 15 of silver bromid or bromo-iodid emulsion, made by any of the usual or well known methods, and also rendered insoluble in the ordinary developing and fixing solutions, and alsoin hot water. (J indicates a coating'or layer of silver bromid or bromo-iodid emulsion, ap-

plied over the coating B, but of much greater or duration to afiect the coating 18 underneath. The relative sensitiveness of the emulsion coating B to the emulsion coating (3 should-not be less than one to fifty,,but in practice it is considerably higher, say one to two hundred, so that light which would afiect the outer coating C would not affect the silver salt in the coating B during a sufficient exposure of the outer coating.

The outer or more sensitive coatm C is, after exposure and development, rea ily removable, and is preterablycomposed of a gelatino argentic emulsion, soluble in warm water.

In using this article and carrying out the process, the paper or sensitized element constructed as described is exposed in the ordinary manner in the camera for a sufficient length of time to permit the light passing through the lens to afi'ect the silver salt in the outer emulsion only, then the image thus formed is developed in an of the usual developers, afi'ecting the si ver in the outer coating only. The developer is then prefera'bly washed from the print, whichv is then exposed to the action ofactinic light, and this, passing through the transparent or translucent portions of the negative, will afiect the lower coating B.

, After printing for a suficient length of The resulting print is a positive, but of necessity the objects in the picture are re- -purposes, and particularly tography embodying a base orsupport an insoluble light sensitive layer of s' ver' haloid emulsion thereon and asuperposed soluble layer of silver haloid emulsion of greater sensitiveness.

3. A sensitized element for use in photography embodying a support, an insoluble layer of silver haloid emulsion, and a super- --image in said outermost layer while in poposed soluble layer of silver haloid emulsion. 4. The method of making photographic prints consistingin exposing to the action of light in a camera, the outermost layer of a sensitized element em'bodymg a support, a

layer of insoluble light sensitive material and a-superposed'soluble layer of relatively more sensitive material, developing the sition over the lower layer, exposing the lower layer to the action of light passing through the negative thus formed and while the latter is in position thereon, dissolving the negative and finally developing, fixing and washing the print formed in the lower la er.

pnntsconsisting in exposing in a camera the v outermost layer of a sensitized element embodying a support, an insoluble light sensit ve layer and an outer soluble light sensitlve layer of greater sensitiveness, subjecting the element to the action of a developer, light printing through the negative thus formed upon the lower layer of sensitized material and while the same is in position thereon, dissolving the negative and finally developing, fixing and Washing the print formed in the lower layer.

6. The method of making permanent photograph1c prlnts consisting in exposing in a camera the outermost and more highly sensitlve one of two distinct sensitive elements 1n the presence of the other while said elements are in intimate relationship each of sald elements containing haloid salts those in the outermost being more sensitive than those in the innermost element, developing the lmage in said outermost element while in the same relationship with the other element, exposing the latter to light passing through the negative thus formed, without changing their original relationship, separating the elements and finally developing, fixing and washing the print formed in the less sensitive element.

I JOHN G. CAPSTAFF.

Witneses:

JOHN E. SEEARER, C. E. MARTIN. 

